Heater/defrost not blowing air properly

MICHAEL BURLEY

MEMBER
2000 MERCURY MOUNTAINEER
5.0L
V8
4WD
AUTOMATIC
219,000 MILES

I just bought this vehicle and my heat works, but it won't blow very well through the truck. It won't keep windshield defogged or defrosted. It also sat for three years not sure if that helps.

Friday, February 8th, 2019 AT 5:57 AM

3 Replies

SCGRANTURISMO

MECHANIC
4,897 POSTS

Hello,

This might be caused by your vehicles blower motor capacity degrading. Here is a link that will take you to a guide that will help you run down the problem:

https://www.2carpros.com/articles/low-or-no-air-flow-from-vents

Please go through this guide and let us know what you find out.

Thanks.
Alex
2CarPros

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Friday, February 8th, 2019 AT 6:14 AM

MICHAEL BURLEY

MEMBER
3 POSTS

Thank you Alex. I will check it out. Because it does make a weird humming noise when it's on high too. So thank you.

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Friday, February 8th, 2019 AT 7:20 AM

KEN L

MASTER CERTIFIED MECHANIC
48,289 POSTS

It does sounds like the blower motor is bad. here is a guide to walk you through the steps and diagrams to help you change it out on your car:

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

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